Estimating Rainfed Maize Evapotranspiration Using the FAO Dual Crop Coefficient Method on the Loess Plateau

doi:10.3969/j.issn.1000-6362.2017.03.002

Abstract

Abstract: Evapotranspiration (ET) is the only term which appears in both land surface energy balance equation and water balance equation, accurate estimation of ET is challenging but of impotance for assessing biomass production, allocation of water resources, and improving crop water ues efficiency in rainfed agricultural ecosystem. This paper invested the applicability of FAO dual crop coefficient approach in estimating ET and its components (plant transpiration and soil evaporation) of rainfed maize in semi-arid region of the Loess Plateau. Continuous measurements of ET with eddy covariance system in 2011 and 2012 were used to validate the performances of FAO dual crop coefficient approach. The results indicated that reference evapotranspiration were 628mm in 2011 and 553mm in 2012. The FAO dual crop coefficient approach was acceptable in estimating ET compared to eddy covariance measurements, with RMSE, AAE and R2 of 0.864mm·d-1, 0.678mm·d-1 and 0.755 (P＜0.01) in 2011, 0.676mm·d-1, 0.693mm·d-1 and 0.781 (P＜0.01) in 2012, and the measured and estimated ET values were 400.3 and 492.7mm in 2011, 372.6 and 441.4mm in 2012, which confirmed the good performances of FAO dual crop coefficient for estimating ET. Soil evaporation and maize transpiration accounted for 36.4% and 63.6% of total ET in 2011, 31.7% and 68.3% in 2012, respectively, indicating that maize transpiration was the main component of ET.

Key words: Maize, Dual crop coefficient approach, Evapotranspiration, Eddy covariance system

FENG Yu, GONG Dao-zhi, WANG Han-bo, HAO Wei-ping, MEI Xu-rong, CUI Ning-bo. Estimating Rainfed Maize Evapotranspiration Using the FAO Dual Crop Coefficient Method on the Loess Plateau[J]. Chinese Journal of Agrometeorology, 2017, 38(03): 141-149.

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